Distinct forms of the beta subunit of GTP-binding regulatory proteins identified by molecular cloning.
Copyright policy )Distinct forms of the beta subunit of GTP-binding regulatory proteins identified by molecular cloning.
Two distinct beta subunits of guanine nucleotide-binding regulatory proteins have been identified by cDNA cloning and are referred to as beta 1 and beta 2 subunits. The bovine transducin beta subunit (beta 1) has been cloned previously. We have now isolated and analyzed cDNA clones that encode the beta 2 subunit from bovine adrenal, bovine brain, and a human myeloid leukemia cell line, HL-60. The 340-residue Mr 37,329 beta 2 protein is 90% identical with beta 1 in predicted amino acid sequence, and it is also organized as a series of repetitive homologous segments. The major mRNA that encodes the bovine beta 2 subunit is 1.7 kilobases in length. It is expressed at lower levels than beta 1 subunit mRNA in all tissues examined. The beta 1 and beta 2 messages are expressed in cloned human cell lines. Hybridization of cDNA probes to bovine DNA showed that beta 1 and beta 2 are encoded by separate genes. The amino acid sequences for the bovine and human beta 2 subunit are identical, as are the amino acid sequences for the bovine and human beta 1 subunit. This evolutionary conservation suggests that the two beta subunits have different roles in the signal transduction process.
- California Institute of Technology United States
570, Base Sequence, molecular evolution, Macromolecular Substances, Brain, Nucleic Acid Hybridization, DNA, Cell Line, Genes, GTP-Binding Proteins, Sequence Homology, Nucleic Acid, Adrenal Glands, Animals, Humans, Cattle, Amino Acid Sequence, RNA, Messenger, Cloning, Molecular, signal transduction, human myeloid HL-60 cells
570, Base Sequence, molecular evolution, Macromolecular Substances, Brain, Nucleic Acid Hybridization, DNA, Cell Line, Genes, GTP-Binding Proteins, Sequence Homology, Nucleic Acid, Adrenal Glands, Animals, Humans, Cattle, Amino Acid Sequence, RNA, Messenger, Cloning, Molecular, signal transduction, human myeloid HL-60 cells
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